HF goes straight to the bone and makes the bone into
mash and it is very painful. I had an experience with it from a
punctured glove. Calcium shots on the affected area to counteract the
effects are administered to the victim also calcium should be taken
orally. The person will not know that he has come in contact with HF
till it reaches the bone and there will be a reddish area where it
contacted the skin. Yes it is nasty. Use plenty of gloves and rinse and
rinse after working with it, then it is not so bad to use it.
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Wednesday, April 19, 2006 4:03 AM
To: [log in to unmask]
Subject: Re: [TN] RD Technologies Vapor Phase Users
They shouldn't smoke anywhere near any fluoropolymer vapour, liquid or
particle. Many decades ago, I had an employee turning a piece of PTFE
and some swarf flew up onto a lit ciggy dangling from his lips. Result:
he was taken into hospital intensive care, after a couple of hours, for
5 days, not so much from the HF but because of carbonyl fluoride, F2CO.
This is a close relative to phosgene (Cl2CO) but is even more toxic and
the poor guy had permanent lung lesions. Fortunately, we had a no
smoking notice clearly posted in the machine shop, so he was held
responsible for the accident. F2CO can also result from inhaling VP
vapour through lit tobacco. Nasty stuff.
Brian
Jeff Brown wrote:
> Hi all,
>
> I have had good results with another brand of VP oven - but I'm not
> supposed to name names here am I...?
>
> The reason that you won't find fluids much higher than 260 degrees is
> that the fluoro polymer breaks down at 300 degrees to produce
> hydrofluoric acid, which is really nasty stuff. Below this temperature
> it is claimed to be quite safe. Very good reason for operators to
> avoid getting the fluid on their hands and then smoking - they end up
> breathing the HF straight in! Not nice.
>
> Regards,
> Jeff Brown
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Gregory
> Sent: Wednesday, 12 April 2006 4:46 AM
> To: [log in to unmask]
> Subject: Re: [TN] RD Technologies Vapor Phase Users
>
> Honestly,
>
> I've never had to clean the preheat section. However, the vapor
> chamber is where I've spent most of my time. You'll get flux residue
> on the walls, and a nice green "algae-ish" stuff on the cooling coils.
> And you're right, it is NOT fun to clean. I wouldn't try the Easy-Off
> either, it just makes more of a mess than anything. I definitely clean
> more often then 200 hours.
>
> I would imagine the 230 fluid you have is for 63/37 soldering.
>
> BTW, I tried looking fluid that went higher than 260 (for HMP paste).
> I couldn't find any.
>
>
> Jason Gregory
> Manufacturing Engineer
> Innova Electronics
> (281)653-5593
> (281)653-5594 fax
> (281)594-0602 cell
> [log in to unmask]
>
> -----Original Message-----
> From: Steve Gregory [mailto:[log in to unmask]]
> Sent: Tuesday, April 11, 2006 1:19 PM
> To: TechNet E-Mail Forum; Jason Gregory
> Subject: RE: [TN] RD Technologies Vapor Phase Users
>
> Hi Jason!
>
> We have some of the same fluid as you, although we have some LS-230
> too (not quite sure why that fluid is there...need to ask some
> questions about that.
>
> I read the manual and it said the vapor chamber should be cleaned
> every 200 hours of operation, is that what you've found too? Or should
> it be cleaned more (or less) often? Also, is the vapor chamber what
> gets most dirty?
> Or
> does the area around the preheat panels get dirty too?
>
> Looking at the machine, I can see that it is going to be a pain to
> clean everything down inside the vapor chamber as they state in the
manual.
>
> Kind regards,
>
> -Steve Gregory-
> Senior Production Engineer
> OAI Electronics
> 6960 East 12th Street
> Tulsa, Oklahoma 74112
>
> (918) 836-0507
> (918) 706-2779 CELL
> (918) 836-0184 FAX
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Gregory
> Sent: Tuesday, April 11, 2006 12:38 PM
> To: [log in to unmask]
> Subject: Re: [TN] RD Technologies Vapor Phase Users
>
> Hi Ramon,
>
> Pros:
> -Ability to process problematic high temp boards (thicker than .063",
> high layer counts, etc.) and not have to jack with as many variables
> as in convection or IR -Excellent thermal equilibrium across the
> assembly and not having to worry about shadowing or thermal thieving
> -Probing your board to determine preheat and then knowing your peak
> area's temp already and looking through a little window to observe
> reflow and giving an extra 15 or 20 seconds over for wetting
>
> Cons:
> -Fluid is expensive and if you have excess dragout, you will notice
> financially. Fluid is about $1000/gallon -Higher than usual
> expectations for tombstoning if your board design is a little lopsided
> (heavy ground planes connected to one side of passives) or if your
> process is a little off.
> -Machine is a booger to clean
>
>
> Jason Gregory
> Manufacturing Engineer
> Innova Electronics
> (281)653-5593
> (281)653-5594 fax
> (281)594-0602 cell
> [log in to unmask]
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
> Sent: Tuesday, April 11, 2006 11:36 AM
> To: [log in to unmask]
> Subject: Re: [TN] RD Technologies Vapor Phase Users
>
> Hi Jason:
> I believe that Vapor phase has a lot of good
merits.
> Could you share your experience with the machine? Pros and Cons.
> Regards,
> Ramon
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Gregory
> Sent: Tuesday, April 11, 2006 12:13 PM
> To: [log in to unmask]
> Subject: Re: [TN] RD Technologies Vapor Phase Users
>
> Hello Steve,
>
> We have a RD here and we use Galden HS-260
>
>
> Jason Gregory
> Manufacturing Engineer
> Innova Electronics
> (281)653-5593
> (281)653-5594 fax
> (281)594-0602 cell
> [log in to unmask]
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: Tuesday, April 11, 2006 10:33 AM
> To: [log in to unmask]
> Subject: [TN] RD Technologies Vapor Phase Users
>
> Mornin' All!
>
> I've just got the opportunity to work with a new vapor phase reflow
> system here at my new position. It's a RD Technologies RD3 with a
> vapor recovery system. We're in the process of hooking it up, we
> haven't yet started it up.
>
> I worked with a vapor phase many years ago (1988), and this system is
> much nicer than what I remember about the system I worked with in the
> past.
>
> I was wondering if there are any RD Technologies users out there that
> have any "words of wisdom" that they might share with me about the
> system I'm that going to be working with. BTW, we're going to using
> Galden heat transfer fluids.
>
> Kind regards,
>
> -Steve Gregory-
> Senior Production Engineer
> OAI Electronics
> 6960 East 12th Street
> Tulsa, Oklahoma 74112
>
> (918) 836-0507
> (918) 706-2779 CELL
> (918) 836-0184 FAX
>
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